How to make a block point to where your see.

Hi everybody, I'm trying to make a flashlight in minecraft. But I have trouble with the procedure look xyz raytrace distance fluid mode block mode.

Basicily what I'm saying, is I want my flashlight item to light the minecraft world where I'm looking, like the wall, floor, or ceiling. 

But what i'm trying to do is make my custom block point where I'm looking and not colide into other blocks. Which means when It's going though another block it say out of it.

Can anyone help. That will be nice.